C# Socket连接请求超时处理

在Socket的超时时间默认20多秒，而实际连上不需1秒时间，20多秒很多时候用户是不能接受的，而在等待返回结果的这段时间里程序会处于停止响应状态！废话不多说了，先上代码！

 private delegate string ConnectSocketDelegate(IPEndPoint ipep, Socket sock);


private string ConnectSocket(IPEndPoint ipep, Socket sock)
        {
            string exmessage = "";
            try
            {
                sock.Connect(ipep);
            }
            catch (System.Exception ex)
            {
                exmessage = ex.Message;
            }
            finally
            {
            }

            return exmessage;
        }

 private void Button1_Click(object sender, EventArgs e)
        {
            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.4.1"), 8266);//IP和端口
            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            ConnectSocketDelegate connect = ConnectSocket;
            IAsyncResult asyncResult = connect.BeginInvoke(ipep, sock, null, null);

            bool connectSuccess = asyncResult.AsyncWaitHandle.WaitOne(2000, false); //2秒后结束
            if (!connectSuccess)
            {
                MessageBox.Show(string.Format("连接失败！错误信息：{0}", "连接超时"));//2秒后弹出

            }
        }